PHP crate an object from a class inside another class -
hello trying create class object class keep getting unknown error don't seem resolve
this "helper class" takes content xml file
class helperclass { private $name; private $weight; private $category; private $location; //creates new puduct object it's atributes function __construct(){} //list pruducts thedatabase function listpruduct(){ $xmldoc = new domdocument(); $xmldoc->load("storage.xml"); print $xmldoc->savexml(); } ?> } and here trying crate object hleprclassclass , call method listproducts helperclass, code wont work if try instantiate object of helperclass
<?php //working code... class busniesslogic { private $helper = null; public function __construct() { } public function printxml() { $obj = new helperclass(); $obj->fetchfromxmldocument(); // want store new object somewhere, maybe: $this->helper = $obj; } }
} ?> after of guys figured out , wanted do
<!doctype html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title></title> </head> <body> <?php require 'bussineslogic.php'; $obj = new busniesslogic(); $obj->printxml(); ?> </body> </html>
your second code snippet wrong. can't evaluate code inside class def. inside methods of class. try putting code in constructor:
class busniesslogic { private $helper = null; // defining property 'helper' literal // private $helper = new helperclass(); // throw error because // it's not allowed in php. public function __construct() { $obj = new helperclass(); $obj->listpruduct(); // want store new object somewhere, maybe: $this->helper = $obj; } } this example of how code can executed on object creation.
though wouldn't actuall use way. i'd rather pass object in or setting later.
ref: dependency injection
once object created can whatever want it. e.g. call methods (which, of course, have defined) on or pass other objects.
Comments
Post a Comment